size of gallium is less than aluminium due to d-orbitals,but why so?


2 years ago

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                                        Hi Ranjita,

The atomic radius of the Ga is less than Al because of poor screening effect.
The atomic radius of Ga is slightly lesser than of Al because in going  from Al to Ga, the electrons have already occupied 3d sub shell in Ga.  The screening effect of these intervening electrons being poor, has  less influence to decrease the effective nuclear charge, therefore the  electrons in Ga experience more forces of attractions towards nucleus to  result in lower size of Ga than Al.

Regards,


2 years ago

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